Automatic turning machine



Filed Nov. 4, 1929 4 Sheets-Sheet l l l l :51111 May 10, 1932- D.TuRcoTT AUTOMATIC TURNING MACHINE Filed Nov. 4, 1929 4 Sheets-Sheet 2May 10, 1932. D. TURCOTT 1,857,986

AUTOMATIC TURNING MACHINE Filed Nov.`4, 1929 4 Sheets-Sheet 3 May 10,1932. D. TuRcoTT AUTOMATC .TURNING MACHINE 4 Sheets-Sheet 4 ,Filed Nov.4, 1929 y Inc/671167'- Qwmkaz/d/ Ta/CQZZ B Y "Quad Patented May 10, 1932UNITED STATES PATENT orifice` -V DAVID TURCOTT, F.' BELOIT, WISCONSIN,ASSIGNQR TO YATES-AMERICAN MACHINE COMPANY, 0F BELOIT, WISCONSIN, A0,013PORATIQN0F DELAWARE l AUTOMATIC TURNING Meennvni Application meaNovember 4, 1929. smaila; 404,595.

y The present invention relates to automatic wood-turning lathes of .thetype in which the Work is brought into engagementwith rotating knivesand is rotated on its own axis 155 while in such engagement.v l

The principal object of `the invention is to provide a novel-pneulnatically operated tail stock for such a lathe, which tail stockis in many respects a very distinct improve- 16 ment over the tailstocks heretofore employed. l

A tail stock constructed in accordance with the invention isinstantaneous. and dependable in its operation, grips. vthe work firmlyIt' when actuated by the operator, andreleases the work automaticallyafter the turning operation has been completed.

@ther objects and advantages of the invention will be apparent upon afull understand- '7N ing of the construction, arrangement and operationofthe improved tail stock.

In order'that the invention may be readily understood, one formofthesaine is presented herein, but it will of course be apprely forthepurpose of exempli'iication and that the invention is susceptible ofembodiment in.A other structurally modi-hed forms coming Fig. 5 is atransverse section, taken on the" line 5-5 of Fig. 3'; A l

Fig. y6 is vanother transverse section, taken ontheline6'-6io`fFig.3; fy

Fig.v 7 isa front view of the tail stocl'r,..cor responding to Fig.V `3but showing the same in its retracted or inoperative position;

6o Fig. 8 is a longitudinal horizontal section ciated that. such formhasbeen chosen inereequally within the scope ofthe appended l through thecasingj21from one end to the:

through the tail stock, takenonthe'line 8- 8 0 fl"ig.-7;v v Fig, 9 is atransverse section, taken on the line 9-9 of Fig. 7; and Fig. 10 is'another transverse section, taken on the line 1Q- 10 ofFig, 7. f- Thelathe shown in the drawings includes a main frame 10, a set of rotatingknives l1 supported bythe frame, a carriage 12 pivoted at 13v to theframeforniovement toward and away from the latter, a head stock 1 4Onthe carriage having a rotatingehuck 15, a ltail stock 16 on thecarriage having a rotating chuck 17, and a hand lever 18 pivoted at 19to the frame and connected by a link 20 to the carriage for movingthelatter 12o-bring the piece of rotating stock gripped between the chucksinto engagement with. the. rotating lrnives for' the period of thecutting opera 1011. The tail stock l--in which the present invention isembodiedvincludes an elongated circular casing 21; which is providedwith a flat outspread attaching base. 22. The ybase 22 rests upon thetopof the carriage adjacent the rightend thereof, and. is held inanydesired position longitudinally ofthe carri-age by-bolts 23 which extendinto and interlock with a longitudinally extending T-shaped'A slot 24 inthe top of the carriage, which slot also serves as a guideway lfor apositioning rib 25 on the bottom ofthe base. J The chuck 17 of the tailstock is. detachably securedY to a long spindle 2.6l whichy extendsother and is journaled' in a sleeve 27 onV two spaced series ofroller-bearings 28- and/ 29.y The sleeve 27 isshiftable longitudinallywithin a close fitting cylindrical borenSO formed' in the left end ofthe casinggfi'nairtight as-f soci-ation therewitl'i, and terminatesiin.antintegralpiston 8 1which is shiftable longitud-i nally within a closetting cylindrical bore' 32 of greater diameter than the bore 3() formedin the center of thev Casing, likewise in air-tight associationtherewith. i The chuck 17, with the spindle 26 yand the sleevedpiston3l, is shi-ftableto the. right, from the projected orY operativeposition shown inf 4 to the retracted orl .inoperative position 10oshown in Fig. 8, against the yielding resistance of a strong coil spring33 which encircles the spindle and is compressed between a collar 34keyed to the latter and a plug 35 screwed into th-e right end of thecasing. The chuck 17 is caused to shift in the direction described by aninrush of compressed air or other fluid which enters the bore 32 `of thecasing through an inlet port 36 and acts against the left side of thepiston in the annular chamber 37 formed about the portion of thesleeve`27 which projectsinto the bore 32. When the chuck 17 is to beshifted in the opposite directionfinto engagement with the end of apiece of work, the air in the chamber 37 is released through an exhaustport 38, and the spring 33 projects the chuck with sullicientfforce toembed it lirmly in the end of the work. u

The compressed air which is used in retracting the chuck 17 against the`resistance of the spring 33 isconducted through a liexible hose 39 toapipe 40,r which pipe in turn conducts the air Vto a spring-seated valve41 which is positioned in va housing 42 attached to the side of thecasing 21-in communication with the inlet port 36. When the valve 41 isseated, as shown in Fig. 5, the air is preunder a shoulder 54 on alinger 55.

vented from entering the'chamber 37, but, when such valve is'raised upoff of its seatby the engagement of a tappet screwl43 in one end of arocker 44 with an aligned stem 45 on the valve, as shown in Fig. 9, theair enters the chamber 37 and forces the piston to v the right, therebyretracting the chuck into its inoperative or loading position. Wheneverthe valv-e 41 is opened, another springpressed valve 46 incommunication-with the exhaust port 38 is closed, and, whenever thevalve 41 is closed, the valve 46 is opened, the valve 46 being actuatedVby a tappet screw 47 in the opposite end of the rocker 44.

The rocker 44 is pivoted at 48 to the housing 42, and, in the projectedposition of the chuckf17, is tilted into the air-releasing positionshownin Fig. 3 by a spring 49 which is compressed between the rocker andthe housing. When the turning' operation on the piece of work has beencompleted, the operator swings the carriage-12 back away from the frame10 by moving the hand lever 18, and, when the carriage reaches a certainpoint in its backward travel, a cam 50 which is pivoted at 51 to abracketv 52 attached to the front portion of the frame, engages with aroller 53 on one end of the rocker 44, causing the rocker to tilt fromthe position shown in Fig. 3 to the position shown in Fig. 7 ',-in whichlatter position the inlet valve 41 is opened, the outlet valve 46 isclosed, and Vthe end of the rocker opposite the roller catches Thefinger 55 isv'pivoted at 56 tothe casing 21 and is connected at its freeend with 'a remote-control pull wire 57 leading through a Vthe rollerwithout aecting the latter.

by moving the linger piece 59, and the Vchuck 17 is in consequenceforced into'the end of the work, inreadiness for the operator to swingthe carriage 12 toward the frame 10 to commence, the cuttingY operation.As the carriage 12 moves forwardly, the roller 53 on the rocker 44 movesinto engagement with the back of the cam 50, and the cam, being free toturn in a counterclockwisedirection as viewed in Fig. 2, rides out ofthe path of The finger 55, instead of being tripped with the lingerpiece 59 on the hand lever, may be tripped if desired by moving a handle60,

which rojects forwardly from the lower end of the linger.

The chuck 17 is rotated by a gear 61 whichv is splined ontoy theVcollar34 at 62, which arrangement permits the collar to shift axiallywithin the gear when the chuck 17 and spindle 26 are shifted axially.The gear 61 receives its rotary movement from al pinion (not shown)which is splined onto adriving-shaft 63. The chuck 15 of the head stock14 is similarly rotated from the shaft 63.

I claim:

1. In a lathe, a frame, a plurality of knives mounted for rotarymovement on the'frame, a carriage hinged for movement'toward and awayfrom the frame from a loading position to a cutting position and backagain, manually operated means for moving the carriage, head and tailstocks having axially aligned work-engaging members forh'olding a pieceof work therebetween, spring means `for shifting one of thework-engagingmembers toward the other to grip the work, liuidoperatedmeans for shifting the same workengaging member away from the other torelease the work, means for automatically actuating the fluid-operatedmeans vwhen the carriage is moved away from the frame upon completion ofthe cutting operation, and manually operated means for rendering 'thefluid-operated means inoperativewhereby to allow the spring means tooperate.

2. In a lathe, a frame, a plurality of knives mounted for rotarymovement on the frame, a carriage hinged for movement'toward and awayfrom the frame from a loading position to a cutting position and backagain, a hand lever for moving. the carriage, head and tail stockshaving axially aligned work-engaging members for holding a piece of worktherebetween,I spring means for -moving one of the work-engagingmembersV toward the other to grip the work, Huid-operated means forshifting the same work-engaging member away from the other to lreleasethe Work, means for automatically actuating the fiud'- operated meanswhen the carriage is moved away from the frame upon completion of thecutting operation, and a trigger device on the hand lever for renderingthe fluid-operated mea-ns inoperative whereby to allow the spring meansto operate.

In witness whereof I have hereunto subscribed my name.

DAVID TURCOTT.

